21481169421964 has 96 divisors (see below), whose sum is σ = 45751343339520. Its totient is φ = 8614827187200.

The previous prime is 21481169421961. The next prime is 21481169421989. The reversal of 21481169421964 is 46912496118412.

It is a super-2 number, since 2×21481169421964² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21481169421899 and 21481169421908.

It is not an unprimeable number, because it can be changed into a prime (21481169421961) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 409990209 + ... + 410042599.

It is an arithmetic number, because the mean of its divisors is an integer number (476576493120).

Almost surely, 2^{21481169421964} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21481169421964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22875671669760).

21481169421964 is an abundant number, since it is smaller than the sum of its proper divisors (24270173917556).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21481169421964 is a wasteful number, since it uses less digits than its factorization.

21481169421964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57359 (or 57357 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 58.

The spelling of 21481169421964 in words is "twenty-one trillion, four hundred eighty-one billion, one hundred sixty-nine million, four hundred twenty-one thousand, nine hundred sixty-four".